Question You must stop at a railroad crossing when: Answers Directed to do so by a flagger. It is controlled by a stop sign. Flashing red signals and gates are present and operating. All of the above. Explanation You must stop at a railroad crossing when directed to do so by a flagger or stop sign. Stop when flashing red signals and gates are present and operating. This questions appears in the following tests: South Carolina Practice Test West Virginia Practice Test Michigan Practice Test Colorado Practice Test Wisconsin Practice Test Missouri Practice Test Iowa Practice Test Idaho Practice Test Louisiana Practice Test Minnesota Practice Test North Dakota Practice Test Massachusetts Practice Test Texas Practice Test Washington Practice Test New Hampshire Practice Test Alaska Practice Test Florida Practice Test New Jersey Practice Test Vermont Practice Test Pennsylvania Practice Test Utah Practice Test Indiana Practice Test Maine Practice Test Nevada Practice Test Montana Practice Test Oregon Practice Test Rhode Island Practice Test Virginia Practice Test Hawaii Practice Test